sethead is a utility for setting FITS or IRAF header keyword values.
It parses the command line to separate file names from keywords. File names
must have the extension .imh for either version 1 or version 2 IRAF files
or must be legal FITS files. Keyword names may be
entered in either upper or lower case; they will be automatically translated
to upper case by the program. Each keyword should be followed by an equal
sign and the value to which it is to be set, with no intervening spaces.
Values which are all numeric are assumed to be numbers and are aligned as
such within the header. A list of filenames may be used by prefacing
the name of the file containing the list with a @. The results
of the changes can be checked by reading individual header keywords using
gethead or by printing the entire header
Set FITS and IRAF Image Header Keyword Values
In version 2.6.11 and later, sethead can be used to update date keyword
values from the old FITS dd/mm/yy format to ISO 8601's yyyy-mm-dd using the -d
Last updated 30 July 2002 by